MB Quart NA4-400.1 Nautic compact 400 watt mono powersports subwoofer amplifier with waterproof potted internals and quick release connectors. Features: Compatible Vehicle Fitment Universal Low Noise Preamplifier Circuit The highly engineered Q-Stasis pre-amplifier stage reduces incoming noise from source units dramatically improving sound quality. RCA Inputs 1 pair high temperature impact resistant nickel-plated RCA inputs that allow for secure connections and are corrosion resistant. Operation Mode Mono operation Crossover Type Dial LPF: Complete control of amplifier signal, essential when using two or more amplifiers. Class / Topology Full Range Class D: Highly efficient circuit topology which helps the amplifer develop a lot of power in a very small heatsink. Output Device Technology PWM MOSFET Power Supply: Stable power through the PC board with minimal heat generation. Heat Sink Aluminum: Quickly dissapates heat to allow the amplifer to run lower impedance for longer duration. Power Supply Simpatico Coil Design: The dual coil Pulse Width Modulated power supply keeps voltage constant through the Ultra-Fi output devices. Bass Remote Included Included: Wired Bass Remote allows adjustments to gain level to be made from the control mounted anywhere in the vehicle. Specifications: IPX Rating: IP67 Compatible Vehicles: Universal Amp Class: Full Range Class D Amp Total Channels: Mono Amp Max Power (watts): 400 Amp Power @ 2 Ohms (ch x watts): 1 x 400 Amp Power @ 4 Ohms (ch x watts): 1 x 200 Amp Crossover: Electronic Amp Variable Low Pass Crossover 12dB per Octave: 50Hz-150Hz Amp Bass Boost: 0-12dB Amp Subsonic Filter: 15Hz-50Hz Amp Variable Voltage: 0.2-9V Amp Signal to Noise: > 100dB Amp Frequency Response: 17Hz-165Hz Amp Total Harmonic Distortion (THD): 1.0% Amp Speaker Level Audio Inputs: RCA Amp Power Terminal 12v/GND: 12 AWG Quick Connector Amp Speaker Terminal Wire Gauge: Molex Plug Connector Amp Fusing: 30A x 1